Hi Slki,
On Mon, May 30, 2016 at 10:22 AM, Seulki Shin <sskcorea@xxxxxxxxx> wrote:
> Hi,
>
> I'm trying to make a BLE avdertising device.
> But I have difficulty to use Bluez D-Bus C APIs.
>
> When I try to call RegisterAdvertisement(), I got this message.
>
> journalctl message:
> bluetoothd[352]: Failed to read "Type" property of advertisement
>
> dbus message:
> GDBus.Error:org.bluez.Error.Failed: Failed to parse advertisement.
>
> version:
> bluez: v5.39
> kernel: 4.1.15
>
> code chunk:
> static const gchar advertisement_introspection_xml[] =
> "<node name='/'>"
> " <interface name='org.freedesktop.DBus.ObjectManager'>"
> " <method name='GetManagedObjects'>"
> " <arg type='a{oa{sa{sv}}}'
> name='object_paths_interfaces_and_properties' direction='out'/>"
> " </method>"
> " </interface>"
> " <interface name='org.bluez.LEAdvertisement1'>"
> " <property type='s' name='Type' access='read'>"
> " </property>"
> " <property type='as' name='ServiceUUIDs' access='read'>"
> " </property>"
> " <property type='a{sv}' name='ManufacturerData' access='read'>"
> " </property>"
> " <property type='as' name='SolicitUUIDs' access='read'>"
> " </property>"
> " <property type='a{sv}' name='ServiceData' access='read'>"
> " </property>"
> " <property type='b' name='IncludeTxPower' access='read'>"
> " </property>"
> " </interface>"
> "</node>";
Perhaps ti is missing org.freedesktop.DBus.Properties interface? You
can check that with d-feet or something similar, btw it shouldn't be
necessary to register ObjectManager for advertisement1:
https://git.kernel.org/cgit/bluetooth/bluez.git/tree/doc/advertising-api.txt
> static void _serv_method_call(GDBusConnection *connection, const gchar *sender,
> const gchar *object_path, const gchar *interface_name,
> const gchar *method_name, GVariant *parameters,
> GDBusMethodInvocation *invocation, gpointer user_data)
> {
> GVariantBuilder *b, *b1, *b11;
> b = g_variant_builder_new( G_VARIANT_TYPE("a{oa{sa{sv}}}"));
> b1 = g_variant_builder_new( G_VARIANT_TYPE("a{sa{sv}}"));
> b11 = g_variant_builder_new(G_VARIANT_TYPE("a{sv}"));
>
> g_variant_builder_add(b11, "{sv}", "Type",
> g_variant_new_string("peripheral");
> g_variant_builder_add(b1, "{sa{sv}}",
> "org.bluez.LEAdvertisement1" , b11);
> g_variant_builder_add(b, "{oa{sa{sv}}}",
> object_path, b1);
> g_dbus_method_invocation_return_value(invocation,
> g_variant_new("(a{oa{sa{sv}}})", b));
> }
>
> static const GDBusInterfaceVTable adv_interface_vtable = {
> _adv_method_call,
> NULL,
> NULL,
> };
>
> node = g_dbus_node_info_new_for_xml(advertisement_introspection_xml, &e);
>
> object_id = g_dbus_connection_register_object(
> hci.conn,
> DBUS_ADVERTISEMENT,
> node->interfaces[0],
> &adv_interface_vtable,
> NULL, NULL, &e);
>
> g_dbus_connection_call_sync(
> hci.conn,
> DBUS_BLUEZ_BUS,
> DBUS_BLUEZ_OBJECT_PATH_HCI0,
> DBUS_IF_ADVERTISINGMANAGER1, "RegisterAdvertisement",
> g_variant_new("(o)", DBUS_ADVERTISEMENT),
> NULL, G_DBUS_CALL_FLAGS_NONE, G_MAXINT, NULL, &e);
>
> Is this right way to make an advertisement object and call
> "RegisterAdvertisement()" ?
> How can I register object especially having a dict type properties.
I guess what is missing is the interface to be able to read the
properties, once that is fixed that should work.
> I've already tested python script 'example-advertisement' and it works for me.
> Any comments would be highly appreciated.
>
> Thanks,
> Slki
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--
Luiz Augusto von Dentz
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